/*
 * MIT License
 *
 * Copyright (c) 2023 北京凯特伟业科技有限公司
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.je.bpm.engine.impl.bpmn.helper;

import com.je.bpm.engine.ActivitiException;
import com.je.bpm.engine.ActivitiIllegalArgumentException;
import com.je.bpm.engine.impl.bpmn.parser.FieldDeclaration;
import com.je.bpm.engine.impl.util.ReflectUtil;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;

public class ClassDelegateUtil {

    public static Object instantiateDelegate(Class<?> clazz, List<FieldDeclaration> fieldDeclarations) {
        return instantiateDelegate(clazz.getName(), fieldDeclarations);
    }

    public static Object instantiateDelegate(String className, List<FieldDeclaration> fieldDeclarations) {
        Object object = ReflectUtil.instantiate(className);
        applyFieldDeclaration(fieldDeclarations, object);
        return object;
    }

    public static void applyFieldDeclaration(List<FieldDeclaration> fieldDeclarations, Object target) {
        if (fieldDeclarations != null) {
            for (FieldDeclaration declaration : fieldDeclarations) {
                applyFieldDeclaration(declaration, target);
            }
        }
    }

    public static void applyFieldDeclaration(FieldDeclaration declaration, Object target) {
        Method setterMethod = ReflectUtil.getSetter(declaration.getName(), target.getClass(), declaration.getValue().getClass());

        if (setterMethod != null) {
            try {
                setterMethod.invoke(target, declaration.getValue());
            } catch (IllegalArgumentException e) {
                throw new ActivitiException("Error while invoking '" + declaration.getName() + "' on class " + target.getClass().getName(), e);
            } catch (IllegalAccessException e) {
                throw new ActivitiException("Illegal access when calling '" + declaration.getName() + "' on class " + target.getClass().getName(), e);
            } catch (InvocationTargetException e) {
                throw new ActivitiException("Exception while invoking '" + declaration.getName() + "' on class " + target.getClass().getName(), e);
            }
        } else {
            Field field = ReflectUtil.getField(declaration.getName(), target);
            if (field == null) {
                throw new ActivitiIllegalArgumentException("Field definition uses non-existing field '" + declaration.getName() + "' on class " + target.getClass().getName());
            }
            // Check if the delegate field's type is correct
            if (!fieldTypeCompatible(declaration, field)) {
                throw new ActivitiIllegalArgumentException("Incompatible type set on field declaration '" + declaration.getName() + "' for class " + target.getClass().getName() + ". Declared value has type "
                        + declaration.getValue().getClass().getName() + ", while expecting " + field.getType().getName());
            }
            ReflectUtil.setField(field, target, declaration.getValue());
        }
    }

    public static boolean fieldTypeCompatible(FieldDeclaration declaration, Field field) {
        if (declaration.getValue() != null) {
            return field.getType().isAssignableFrom(declaration.getValue().getClass());
        } else {
            // Null can be set any field type
            return true;
        }
    }

}
